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Direct CO2 atmospheric concentration measurements have been made since the early XIX century. Did you check Joworowski's article?

The ice core data matches Maona Loa only after the 83 year shift.

You might find me At The Edge Of Time.

by Luis de Sousa (luis[dot]a[dot]de[dot]sousa[at]gmail[dot]com) on Mon Jan 28th, 2008 at 11:45:29 AM EST
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